In the past I would pick up outdated and short dated film when I found it cheap.
I never bought any over 5 years old however. Lots of different types and I am sure most if not all were stored at room temp. I never had an issue with any of them.
Today I ONLY BUY FRESH. That is because if the film makers can't sell film when it is fresh they will stop making it. AND they have stopped making lots of my favorites in the last 2 years.